"Use HDMI AVI signalling" video option should only be used at SD resolution

#1

We have a new option in the July update for playback of 4:3 video, in the Player settings: “Use HDMI AVI signalling”. This is a great addition for playing DVD remuxes - for the first time, we can now get the correct aspect ratio for both 4:3 and 16:9 material, with no loss of resolution, and the correct AR being selected automatically instead of having to do it manually.

But…

This is an option which only makes sense for standard-definition videos. If I’m playing (say) a 1440x1080 video, this option should be ignored, and the default should be to display the video pillar-boxed. This feature is needed for SD because SD video is generally 720x480/480 or 720x576/50, and it’s only the metadata which tells the playback device whether it is to be played at 16:9 or 4:3. But in the case of a 1440x1080 video, the aspect ratio is provided by the actual video data, and you don’t need to signal a 4:3 AR.

What my Vero 4K+ seems to be doing at the moment is to stretch the video to 1920x1080, then tell the playback device to display it with a 4:3 aspect ratio. The most visible consequence of this is that subtitles appear horizontally compressed. If it’s doing what I think it’s doing, there will also be some unnecessary horizontal upscaling going on (before the subtitles are added) - if so, that will compromise image quality a little.

I’ve always been dubious about Kodi applying the central 4:3 Playback settings to HD-resolution 4:3 videos; but it makes even less sense with the new option.

Where can I find out more information on system updates?
#10

Actually, if we’re being pedantic, it’s not the resolution of the video source that should control whether this setting is applied, it’s the output resolution. If, for whatever reason, 4:3 SD video is upscaled by the Vero to 1080p or 2160p, then pillarboxing it is the right way to go. It’s only when the actual output is 480i/p or 576i/p that we need to use HDMI signalling.

#11

There is content at 1080p in 4:3.

#12

Yes, it is precisely that content that is not being displayed correctly with the new setting.

#13

Correct. That’s not pedantic at all. By rights, TVs should ignore the a/r in the AVI infoframe for HD resolutions but it seems that’s not so. Also we didn’t have any subtitled content in that format to test so missed the double-scaling. Thanks for pointing it up.

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OSMC's July update is here